On QComm to vulkan partial clears as draws.

Perf graphs were showing a good amount of CPU time spent in
vkCmdClearAttachments. So we want to test if we get any wins by just
always doing draws instead.

Change-Id: If76a26cb0de411a2a1d1d17f17192b2d9fbdc459
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/338319
Reviewed-by: Adlai Holler <adlai@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
1 file changed